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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c125e7c38469fd4a76087574e23b6dbc996d5bc769726a1bf74f5425ea8fbe' 
  AND token = 'NdtNphRUTpTB5cvPIX3/foYRyvzbKnyncbAcRcl1bkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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