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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f292b2f9c2667828324008fc492ccc04d9c1f02c0cb66f341a871b78c487f382' 
  AND token = 'V1/0fLwDQfFJ3GWmN4CPWZoTlt75ie61fQEpw6N+dLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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