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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d6f053ef7f687e685be4e519458a9bb2a34749194d9e9944845c10743de34d' 
  AND token = 'wY+9JaHyGbTYJIYYjNTFG+5aVG/DZH4dJV+0FqLbxek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}