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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86f313da43a0572b6a8c7b4d00e7cae7d80fb224d07e2198c3e6cc71dda985a' 
  AND token = 'paq2suXmUI/4oprimuMj7zPT6n0y2buUINcb6ODNIfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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