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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a95ef50704cf6b5de1dfaa710732237dc4a05d9c5e5ce4ce656406aff307bff' 
  AND token = '9nVWTE4M+0ns63qPpY2J0A4oTPPU7Vd++fNg/RmNd58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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