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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2093cba739fc2778392b41474733beab4e9250ea1b357fc18e941711f7fc1f56' 
  AND token = '5wSszcQNqAqnJ4XQhJ46ivNsYSYbhjh6vHjWx02MeHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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