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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfebe0f86c8a0bccae3c2976ab8ed196785999fb17381e39232947d01c14fa3' 
  AND token = 'PKqTaMI2TyIjTyK1UdXgf68Lr1FS5v96Z91n45DUirA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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