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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636392029c3597d6222d57c517779979df4450c9a7bf457c83f9f4a2fa3fa373' 
  AND token = '5vsSVDS7Omo9TiETHWtHV0mamQxvxVQn/LwnCt0ZpPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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