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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa8d3a2deef44812a2eb343de2814031d6c11a213f2e278dfc9da86e56f843f' 
  AND token = 'cPAg1dbHY64F1vA5xUzYVa73fA2AL+P094CgnAdQhGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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