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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c485abd6610ca3165d7b7c00ea689e25aae3f7ba48f8be073915c4682f87562' 
  AND token = '+oy1eCw4HymXQ0YoBYro2gXfJsGSWhH1OVNA4Nj8dH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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