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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfa6362e19446338b50541c626c8d6a636fecc545a991892c9fce4ce1c1d87f' 
  AND token = 'eAq0/+fPoAio1JWzQuwaov7nNIouBQaQ1PmZBmt9Im0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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