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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688fe2c51be3e3bca07871efe0dc8701639cbca9ae266cc71182f865c94bed90' 
  AND token = '4d+Wgo7Vm5FSn3pTc4ATQmtnkmEgJOkdD7Lju1mr528=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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