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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd045a5a382c3d7266694d67f88fef19a7ebea2990b73f99d48c2cd7d44c4854' 
  AND token = 'bkmz08IXKS4O38MYU07m8WrYMXA0i27+ptWxibHPGiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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