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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d034f6ed1bc332c3cb655cc709985ad99e8f21cbc5140c350bf9c6b007b61e2' 
  AND token = 'c0YBySLWxOEBV7wFx/RyqpzWU0Txy2CuXfT3/kExUcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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