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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6afb15cf9a783fff814852d611f4a54036d2c1c3f9cf401baf8e442d17ba5c' 
  AND token = 'WFqgWKpXYJ4kVB6QH7dwffbOPTUTILynhTIpNJ582s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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