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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fccff6d0ab455fe8c6d6c8b27c1bfee448c005c01b2e68a2052c8ded61e00b62' 
  AND token = 'l2psDbzEa/GfJpD1THjiOjjpsJOwQNxRGMwtFQEikto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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