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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7af5d1bf6931dcf5b69c10e2e2a1d6e5d638797f9baafd0ee7ef6e587814102' 
  AND token = 'Sm5V5rksoTF470EvI2+Sm7trhwkNVCAoYwhYc7GeU54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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