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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44d26c7e20efc060620cf8e1afaf91c24fe799ade8023ae2836edc031940551' 
  AND token = '7QBVxM9agRnQvz+NwJin7F3KEpwTGx+YtgZJegxrSSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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