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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3935891814d7b6d77c80bd0e74ef2ce992d58dce632301c94749b6d07700fe29' 
  AND token = 'iJHwLFq/18jZ86j193/EIF4n5Ir6a/wnqvKIvZJY3+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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