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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f631b0aef39cfc7b895fc9180dc4a7514b925e70952b07dbe7aaae94779f0b64' 
  AND token = 'wxyRCfM8A9iibNvpsAFO6o6eTVqRi2++Rnv4b8zZKxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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