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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c6d62b60ed112497ecbbea2278679d746b07affb6df5e3581437dff1eed502' 
  AND token = 'TFGO0q2/b2LwKm4lU79JXevI7MpwxxhmIgX4MP6Tp+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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