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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889e2f86a1dec8a75a5cdd0b943ffc4e772c8b96901b2f255c2fa7f5e6e9f5ad' 
  AND token = 'FrdYiMfJcXrcdsV40ezitWueuT9pz3EBKF8LhrZGtuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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