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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e972642607998dfd9a8b4dfb00e75fad682f1a2546ab879f2cd3987dfd6e147a' 
  AND token = 'e133lHzDJAXLcgGtT14l7un2WrLUY9Jm4oBQE/0WXT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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