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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac2c683ca52654092fdd5d86aa4745e05c5956459e7c77c9686c16e02bc19e4' 
  AND token = '3sv/1ARt7/ouUDzSbVMlS4fbcb7or8WrTGxvUK7p5Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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