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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e10ebbfd7aa68d9da2c7a56d2a03f0d2c726e59dbf23222547d8e92a40e8d7' 
  AND token = 'fVSELHq9/qpTKa3aeIfPWmyNIQUdCCbpRPTB8IYsHeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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