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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddfcaaa38958744c5257797eed0f750909a2a84375f035ed5ab7fa62f103cb7' 
  AND token = 'X+V/Ua1lYzrh2hD1n7zYVBBhQtlpKfOEXl0clwD7NYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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