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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b595c494d2dc26e05955569c14eb471a8c01bce8f21f773f79fbdba2ed15484' 
  AND token = 'YNeIXyLfQB8TOryS7ytZc40UUQI7aGobgni62LOcQz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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