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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c920e877dd748d9d921d6eac4e6fb863a1c320f3c2f90c5035828ef38dcc5a5a' 
  AND token = 'fx92k2s/pIKokDPZZBgvo2Ep+d8ClLtin3l5kxuc35s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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