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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4813ce9810e0cc8f5a0c6a01b2297af5818eaf6e51d8a6b027eaba077f45cabe' 
  AND token = 't9wW3cQzmzCszyC66UuFeEpOLCPEFhwRSkYqnt7hfoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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