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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c939d7f3c8ae8911d8a0f85ed3f8f84980e3fe402d9e8294b6692f33ea18928' 
  AND token = 't7yemuV1bnCcvpNX31sVgYjzfpY8Q91Ve3bfOJsOO/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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