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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2335765d768c1c664cdb6558f83c2ee4511f5b6e66d26f2691aa4584702c83' 
  AND token = 'jO5584V+qLmweC7bpFweTXf46QoJLFRr/GAW/IRdfWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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