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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4928104a686133a97f99927a8d48812caef293be74c43d1427afb80cbfaaa0' 
  AND token = 'tyJoGneR9YAgalTyDf1buN2JIH5Sc4ICqFqlbHvD2I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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