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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b766894ff2ab904aa647667244882e1c688cb8dd06102aa5ef19dce75007aa43' 
  AND token = '/kVpKyFU2Q+gPOC/bFunqhOmgQz+9Ks9sbOoSMN9a2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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