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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c323120a73cbf25faf225dc289ef0010021c33f11cc0a6f8b477fd145ffe5165' 
  AND token = '7gayA6HEDXd0gxM9/Thh52M9Pw6nbdsr5POQQEjtm2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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