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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafc5c3bbcf17ab68658c68409c3d2e84eb8c9b13beaca8f6891166dd87d2b6a' 
  AND token = 'RvPBDiiV6C8bPcP5eVhX7vLxlSSLHtPb5KDZuqFlsgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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