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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbbe2a8b63dd578595979777c4992621dea8c34b8d1e73a384941ec5d90ea44' 
  AND token = 'x1l6+9w3FsljIG8afdbZRrm2aC6paLV/bN4TNfzxZoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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