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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bada692333d13c89a30c6f5c9fda955984623ef2b1d0e85f86a39a9d3033fa6' 
  AND token = 'nxV1na+Re+H7oNDCx3uECZWIGd4V8SRqhET07hQPp9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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