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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f948ac66a8165d174f5402abc0de66bc102b2a36caba198caff1cf0a4bac55' 
  AND token = '2MDfoLgFqB/VQXD4HG3OLQjZXTpvYYefiYHgF3kRMFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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