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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f16514563915fcba36dbc0bdfe1e18a1912ad68159703cb475bbcb1f0817a6' 
  AND token = '+4gevM4tbyX6dNqADw5g7D0F+rOWCvS5TC9RPrXN4qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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