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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6976568134e72772a9b959245b866314f1d324830ca3fc3aefe344192b1f4344' 
  AND token = 'aCH76P4tKjs9iaQmr6GmdEydUQtD0jUDmunFG2P/aN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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