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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8898484cd6616bfea776109011edd923d4284b7f11a79fee12d8d1d245b9d82' 
  AND token = '4hTI4QRD+bkApdeEmg0hQDwdPAtPK21Vg5kVz2CFHU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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