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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7151db7580e8826ea16484a9505140caa25a4c7f0ccec622ae85394fc1ff105f' 
  AND token = 'sC7GoCialsIP7WVGiIMKEMTwfgHuCzp9Z8e9s2RE8xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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