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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77fa92dbebd26a693c9c6292b960d31120db153f14f37bc8f2b0f6dddef0d3ba' 
  AND token = 'BoAsF9r/NzrDzAkDjQfJjaAkCK8kWknmFmjU/tLZ2WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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