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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df0bf373bb2a49692b6bc4f9f9d9796de7462767c83e9e5449b1fc73e750a0a' 
  AND token = 'nwtGsGozKPVPII3dHWN6NrgrVfK12c90qTClS3O3D0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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