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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8d934a40e002a0cdc9cad4c30c1e4428ebc4a32585c301e5f442a69d8271f0' 
  AND token = 'VRy8wQx3r8l7kOSqikXaXXIk88AiGFHPvYeOlVrfHbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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