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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533f1cda96d0b0761b1675867ab1c478ac02bc4236f125b59607e09091151fdf' 
  AND token = 'Yrst1grfAAkv9rxErYUKf23n1+mlcC720ogefRSFYcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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