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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aebfd033009aca9327f275f960d1fb1b620d9597b63f70e1c0dd3079891a00d' 
  AND token = 'CfUagoT76ob2rrcPoerV/uVWU97ERIeRHQ2+n06YR0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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