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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc5ae6a01554c01286adc846a2093ff5ee931e3739907e572d8cab020ad6f09' 
  AND token = '+Re6nmLf9qB/pCYW4DNpyr1SH82cTNYVOuKy2k+Kv8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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