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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681388ee95edb1f7b4fac5bf42929793a28de3a55b45b749e7e5ad7a4471f6f1' 
  AND token = '+b2ppwROfm4SuzTpHHufl2lrbnH2cz/YVgStAvw8/nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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