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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06e6a73ce29b4d7292df6be451a5d2420ea6c461ed4ac0d55eecf92a7de3a21' 
  AND token = 'p7TCNsUMBDVeZ2Jj9VroE0gJ006+Ka1K7Ig+V65eRFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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