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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1844fc93a387f4e7ed47f04bf9f7711a47e2a5eb989b916b6028146981518f31' 
  AND token = 'Qt4BHDu0Xll8lEyJDCPZllrm7N1nOdZsFsWh934oIPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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