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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07147878d4c46ef8c4d5ff44f785e4bb83c4f51a2d0713625ddc4d76492ed22e' 
  AND token = 'LTQqJ+KorUui0XXiCFY6RgbsJXXZdJ11dGkY9m2s3oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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