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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f51ae3f1b212acfc1444c3957a74410b2d4ee9dd1b690146f3c3db007ad1d44e' 
  AND token = 'Abby78O8Tgo5dUk2YR/f0tDs7YniPWOU3AyJoi4VlLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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