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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c136b8133e07385b49a5ea1d344651c3ae25ebed3a6f7b6217b25fc29a967e9' 
  AND token = 'zsfc62+cyecMCcdu1DyeEbtp/4lG8eor2OE1s26PdFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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