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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b674cead8d55c533f8222fecf62e19b9dd0aee437ae2365d7d32154d8747b54' 
  AND token = 'fBn09qQNFOLIq7BkeG2LPHlEf8wE/x+IxpWpqOlhTlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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