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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadd5db4dd0a263d68d731a18464c74c13123d86d575a890b2e05687ccd7cc29' 
  AND token = '5/HHPh4fLiwkpPWi+3ms+THcQZZzHglTUyIOKN0dbz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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