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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e710b373bb8ee874057140fbc7d2bf9bcfa836d3658b2d3b356a7553d73d5ebd' 
  AND token = 'PYvVb52/YWyX6LVwq0rmU35XbuJF9pPf6PMyoA4gdcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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