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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6611311545fb3fecf62376e754b1e9b11953f5ce258eb889b851abb23eafb0da' 
  AND token = 'iVjBfX3XYB08FC2g+GDkia74o5Q0yY4FIDZpZJAsZFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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