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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fda4af649bec382cb8ba6cff4d0f3f979bdcbcbbd3539c79d8b9b000766544f' 
  AND token = 'l+sp50ecQuVa9R4UrdMqPeWkDIQyY8Kron0Q2ocyDyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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